Guidance System U.N.S.

Universal Navigation System for long distance and curved.

For straight tunnels up to 400 m:

In order to eliminate refraction influences acting to the laser beam as tunnel length increases, the U.N.S. Guidance System is supplemented with a hydrostatic water level to calculate a more accurate vertical machine position.

For long distance and curved tunnels:

A north-seeking gyrocompass is installed in the TBM, which does not need a line of sight to the launch shaft. This allows a precise calculation of the horizontal position of the machine. The vertical deviation of the TBM position from the designed tunnel alignment is calculated using the integrated hydrostatic water level system.

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The New Suez Canal Project in Egypt comprises a new 72 km long canal branch which runs parallel to the existing 190 km long Suez Canal and runs from Deversoir to al-Balah. As part of the new development aimed at bring major economic benefit to this part of the Middle East, four new tunnels are being constructed running beneath the Canal to connect the Sinai Peninsula to the Egyptian mainland. Continue reading…